P
Panopeeper
Guest
Re: Fun with MF images, part 2: What are you shooting with that MF back?
A note on color temperature
I have read on another thread too mentioned, that the color temperature is different in C1 and ACR.
It may be surprising, but the color temperature and tint are not absolute; 5100° is not always 5100°. ACR is transforming the colors from the camera's color space in ProPhoto, etc. based on one or two matrixes. The temperature is relative to these matrixes.
AFAIK ACR is starting out internally always with "standard light A" and D65, i.e. the camera's calibration is always relative to these two illuminations. The transformation with other temperatures will be interpolated between these.
For example when converting a Sinar raw file in DNG by Brumbaer and by eXposure, eXposure generates a matrix describing the transformation under D65, while Brumbaer is using D50 (both generate only one matrix). Accordingly, when you process these two DNG files in ACR and pick WB on the very same spot, you get vastly different temperature and tint. Example: 4700°, +52 with eXposure, 2700° +5 with Brumbaer.
(ACR's internal camera calibration is used only when processing the native raw file; when processing a DNG file, these values will be taken from the DNG metadata.)
A note on color temperature
I have read on another thread too mentioned, that the color temperature is different in C1 and ACR.
It may be surprising, but the color temperature and tint are not absolute; 5100° is not always 5100°. ACR is transforming the colors from the camera's color space in ProPhoto, etc. based on one or two matrixes. The temperature is relative to these matrixes.
AFAIK ACR is starting out internally always with "standard light A" and D65, i.e. the camera's calibration is always relative to these two illuminations. The transformation with other temperatures will be interpolated between these.
For example when converting a Sinar raw file in DNG by Brumbaer and by eXposure, eXposure generates a matrix describing the transformation under D65, while Brumbaer is using D50 (both generate only one matrix). Accordingly, when you process these two DNG files in ACR and pick WB on the very same spot, you get vastly different temperature and tint. Example: 4700°, +52 with eXposure, 2700° +5 with Brumbaer.
(ACR's internal camera calibration is used only when processing the native raw file; when processing a DNG file, these values will be taken from the DNG metadata.)